2168887978020 has 96 divisors (see below), whose sum is σ = 6084117962496. Its totient is φ = 577300953600.

The previous prime is 2168887978001. The next prime is 2168887978043. The reversal of 2168887978020 is 208797888612.

It is a super-2 number, since 2×2168887978020² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284589810 + ... + 284597430.

It is an arithmetic number, because the mean of its divisors is an integer number (63376228776).

Almost surely, 2^{2168887978020} is an apocalyptic number.

2168887978020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2168887978020 is an abundant number, since it is smaller than the sum of its proper divisors (3915229984476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2168887978020 is a wasteful number, since it uses less digits than its factorization.

2168887978020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15781 (or 15779 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 66.

The spelling of 2168887978020 in words is "two trillion, one hundred sixty-eight billion, eight hundred eighty-seven million, nine hundred seventy-eight thousand, twenty".